Heyderman, Laura J.
- Journal Article
Rights / licenseCreative Commons Attribution 4.0 International
Amorphous Fe64Gd36 thin film square elements are investigated by imaging in theFresnel mode of a transmission electron microscope (TEM). The equilibrium statewithout an applied field shows the well-known four-domain flux closure patternwith in-plane magnetization. However, the vortex is displaced from the center ofthe square element and the domain walls are curved. In a reference measurement ofa thin Ni81Fe19 element, the vortex core is perfectly centered and the domain wallsstraight. When an increasing external field is applied in-plane, the vortex core canbe moved. While this motion of the vortex core is linear in NiFe elements, in theferrimagnetic FeGd squares the vortex core moves by sudden jumps. Micromagneticsimulations show that the asymmetry of the domain patterns as well as the vortexcore pinning and depinning can be attributed to random anisotropy and a patchymicrostructure in amorphous films Show more
Journal / seriesAIP Advances
PublisherAmerican Institute of Physics
Organisational unit03997 - Heyderman, Laura
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